/**
 * @license
 * Copyright 2017 Google Inc. All Rights Reserved.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * =============================================================================
 */

import { GPGPUContext } from "./gpgpu_context";
import * as gpgpu_util from "./gpgpu_util";

describe("gpgpu_util createWebGLContext", () => {
  let gpgpu: GPGPUContext;

  beforeEach(() => {
    gpgpu = new GPGPUContext();
  });

  afterEach(() => {
    gpgpu.dispose();
  });

  it("disables DEPTH_TEST and STENCIL_TEST", () => {
    expect(gpgpu.gl.getParameter(gpgpu.gl.DEPTH_TEST)).toEqual(false);
    expect(gpgpu.gl.getParameter(gpgpu.gl.STENCIL_TEST)).toEqual(false);
  });

  it("disables BLEND", () => {
    expect(gpgpu.gl.getParameter(gpgpu.gl.BLEND)).toEqual(false);
  });

  it("disables DITHER, POLYGON_OFFSET_FILL", () => {
    expect(gpgpu.gl.getParameter(gpgpu.gl.DITHER)).toEqual(false);
    expect(gpgpu.gl.getParameter(gpgpu.gl.POLYGON_OFFSET_FILL)).toEqual(false);
  });

  it("enables CULL_FACE with BACK", () => {
    expect(gpgpu.gl.getParameter(gpgpu.gl.CULL_FACE)).toEqual(true);
    expect(gpgpu.gl.getParameter(gpgpu.gl.CULL_FACE_MODE))
        .toEqual(gpgpu.gl.BACK);
  });

  it("enables SCISSOR_TEST", () => {
    expect(gpgpu.gl.getParameter(gpgpu.gl.SCISSOR_TEST)).toEqual(true);
  });
});

describe("gpgpu_util createMatrixTexture", () => {
  it("sets the TEXTURE_WRAP S+T parameters to CLAMP_TO_EDGE", () => {
    const gpgpu = new GPGPUContext();
    const tex = gpgpu_util.createMatrixTexture(gpgpu.gl, 32, 32);
    gpgpu.gl.bindTexture(gpgpu.gl.TEXTURE_2D, tex);
    expect(
        gpgpu.gl.getTexParameter(gpgpu.gl.TEXTURE_2D, gpgpu.gl.TEXTURE_WRAP_S))
        .toEqual(gpgpu.gl.CLAMP_TO_EDGE);
    expect(
        gpgpu.gl.getTexParameter(gpgpu.gl.TEXTURE_2D, gpgpu.gl.TEXTURE_WRAP_T))
        .toEqual(gpgpu.gl.CLAMP_TO_EDGE);
    gpgpu.gl.bindTexture(gpgpu.gl.TEXTURE_2D, null);
    gpgpu.deleteMatrixTexture(tex);
    gpgpu.dispose();
  });

  it("sets the TEXTURE_[MIN|MAG]_FILTER parameters to NEAREST", () => {
    const gpgpu = new GPGPUContext();
    const tex = gpgpu_util.createMatrixTexture(gpgpu.gl, 32, 32);
    gpgpu.gl.bindTexture(gpgpu.gl.TEXTURE_2D, tex);
    expect(gpgpu.gl.getTexParameter(
               gpgpu.gl.TEXTURE_2D, gpgpu.gl.TEXTURE_MIN_FILTER))
        .toEqual(gpgpu.gl.NEAREST);
    expect(gpgpu.gl.getTexParameter(
               gpgpu.gl.TEXTURE_2D, gpgpu.gl.TEXTURE_MAG_FILTER))
        .toEqual(gpgpu.gl.NEAREST);
    gpgpu.gl.bindTexture(gpgpu.gl.TEXTURE_2D, null);
    gpgpu.deleteMatrixTexture(tex);
    gpgpu.dispose();
  });
});

describe("gpgpu_util createPackedMatrixTexture", () => {
  it("sets the TEXTURE_WRAP S+T parameters to CLAMP_TO_EDGE", () => {
    const gpgpu = new GPGPUContext();
    const tex = gpgpu_util.createPackedMatrixTexture(gpgpu.gl, 32, 32);
    gpgpu.gl.bindTexture(gpgpu.gl.TEXTURE_2D, tex);
    expect(
        gpgpu.gl.getTexParameter(gpgpu.gl.TEXTURE_2D, gpgpu.gl.TEXTURE_WRAP_S))
        .toEqual(gpgpu.gl.CLAMP_TO_EDGE);
    expect(
        gpgpu.gl.getTexParameter(gpgpu.gl.TEXTURE_2D, gpgpu.gl.TEXTURE_WRAP_T))
        .toEqual(gpgpu.gl.CLAMP_TO_EDGE);
    gpgpu.gl.bindTexture(gpgpu.gl.TEXTURE_2D, null);
    gpgpu.deleteMatrixTexture(tex);
    gpgpu.dispose();
  });

  it("sets the TEXTURE_[MIN|MAG]_FILTER parameters to NEAREST", () => {
    const gpgpu = new GPGPUContext();
    const tex = gpgpu_util.createPackedMatrixTexture(gpgpu.gl, 32, 32);
    gpgpu.gl.bindTexture(gpgpu.gl.TEXTURE_2D, tex);
    expect(gpgpu.gl.getTexParameter(
               gpgpu.gl.TEXTURE_2D, gpgpu.gl.TEXTURE_MIN_FILTER))
        .toEqual(gpgpu.gl.NEAREST);
    expect(gpgpu.gl.getTexParameter(
               gpgpu.gl.TEXTURE_2D, gpgpu.gl.TEXTURE_MAG_FILTER))
        .toEqual(gpgpu.gl.NEAREST);
    gpgpu.gl.bindTexture(gpgpu.gl.TEXTURE_2D, null);
    gpgpu.deleteMatrixTexture(tex);
    gpgpu.dispose();
  });
});
